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Identifying untraced faults associated with high return temperatures from heating systems in buildings connected to district heating networks

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  • Yang, Qinjiang
  • Salenbien, Robbe
  • Smith, Kevin Michael
  • Tunzi, Michele

Abstract

The district heating (DH) system is in its transition towards the 4th generation district heating (4GDH), and the high DH return temperatures need to be addressed during the process. In the existing building heating systems, many faults, malfunctions, or sub-optimal operations can lead to high DH return temperatures. However, the field of fault detection and diagnostics (FDD) within heating systems is notably under-researched in contrast to their counterparts in ventilation and air conditioning in building HVAC systems. This divergence can be attributed to several factors, including limited digital integration, a scarcity of data, and the non-obvious nature of faults in heating systems. In this study, we utilized heat cost allocators (HCA) and energy meters to investigate the features and potential impacts of four untraced faults that can lead to high district heating (DH) return temperatures in both space heating and domestic hot water systems in large buildings. We identified component-level faults, including heat exchanger overflow, space heating temperature controller failures, and excessive operating temperatures due to bypass, as well as system-level issues such as non-uniform heat distribution in buildings and its impacts. This exploration provides new, critical insights for advancing FDD research in HVAC and DH systems.

Suggested Citation

  • Yang, Qinjiang & Salenbien, Robbe & Smith, Kevin Michael & Tunzi, Michele, 2024. "Identifying untraced faults associated with high return temperatures from heating systems in buildings connected to district heating networks," Energy, Elsevier, vol. 309(C).
    • Handle: RePEc:eee:energy:v:309:y:2024:i:c:s036054422402872x
    DOI: 10.1016/j.energy.2024.133097
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    References listed on IDEAS

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    1. Gadd, Henrik & Werner, Sven, 2013. "Heat load patterns in district heating substations," Applied Energy, Elsevier, vol. 108(C), pages 176-183.
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